python -c 'import sys, time
for i in range(10):
print(i)
sys.stdout.flush()
time.sleep(.1)
' | python -c 'import time, sys
from timeit import default_timer as timer
start = timer()
for line in sys.stdin:
sys.stdout.write(line)
sys.stdout.flush()
end = timer()
if (end - start) > 0.1*1.5:
sys.stderr.write("late " + line)
start = end
' | cat
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